I KNOW THIS HAS BEEN ASKED BEFORE BUT I HAVE NOT BEEN ON IN AWHILE,I AM LOOKING TO BUY CLAMP ON 4" SWITCHABLE MUFFLERS. DOES ANYBODY HAVE A SUGGESTION AS TO WHICH ONES ARE THE BEST.THEY ARE GOING BEHIND A BIG BLOCK WITH A LITTLE OVER 600 HP.

Gaffrig Outlaw They work great for me[IMG]
http://www.raymondbaldwin.com/mmw/im...C_1209_JPG.jpg[/IMG]

I have a bit more hp than you, but couldn't get a good tune on the EFI's with brand X switchable mufflers. Installed two pair of IMCO gatlins (zero back pressure) and I have the sweetest sounding motors on the lake, also no fouled plugs and a clean transom. See if you can't find someone who may have a set in your area and get another opinion...

Drew Marine Shotguns....Meet requirements for a permanent full time muffler and you loose NO horsepower. Adjustable and a very good price. $450 a set.

BH

My question is; how can switchables not change back pressure? I personally killed a lot of spark plugs being a nice guy and idleing into a mirina with my old set...

Anouther reason to use the Shotguns....The backpressure is what opens the butterflies....And the amount of backpressure that it takes to open the butterflies is adjustable....

BH

I JUST TRIED A PAIR OF HPI MUFFLERS FOR THE FIRST TIME TODAY.THEY WORK GREAT.I CANT BELIVE ALL THE NOISE IS GONE!THEY CLAIM THEY ARE 85 DP AT 700-800 RPM. NO RESTRICTION!!!I WILL LET YOU KNOW THIS WEEK IF I THINK THEY RESTRICT. LAKE WAS TO ROLLY TODAY TO OPEN IT UP. HPI IS A LINK ON OSO. RON BENDER

Hey Taz its just plain low life to post with all caps ,,is your keyboard junk or is it you ?? i thought a b-max dist. like you would know better


Kenny above has only a few post he has and excuse for now
come on man work with the guys

Wildthing

Happy to hear that they work for you.

Thanks
Dan

Go with the HPI.